I'm not sure if phones should be banned or not in school

Phones are a major distraction if they´re taken to school, and almost everybody has one, and there are even some people that have two. They could be used to listen to some music, watching videos, texting, bbm-ing, looking at pictures, playing games, and so much more during the class; basically, using phones during classes is only going to make everybody focus... on something else. But should we leave out of the table that phones are really helpful, too? You can get in touch with your parents or family more easily; you can also call if an emergency happens, or you can be available if you get called. Using a cell you can easily call the authorities or medical provider in any extreme case, and we know it could happen. And, you can call for a simple change of plans, or just to know something. You can also tell your parents to bring some homework you left at your house, and stuff like that. With all the pros and cons, I can’t make up my mind, and tell whether phones should be banned, or be allowed at schools.